The two-hour, song-and-dance extravaganza will find Shawn and Gus hunting for a criminally insane playwright named Z (played by Rent‘s Anthony Rapp) who once burned a theater to the ground, with a critic trapped inside.

To get a lead on the psycho Shakespeare, the guys will have to deal with (per the network) “a dangerous and familiar” villain from Shawn’s past who doles out clues in a very cryptic fashion.

In other news, the upcoming eighth (and likely final) season also will include a new episode with a storyline determined by fan vote. Star James Roday will direct that outing, titled “A Nightmare on State Street,” in which an exhausted Gus undergoes dream therapy to understand the cause of his night terrors. But when he’s done with the treatment, everything’s a little… off.

Attendees at the panel discussion — which included the show’s cast and producers and was moderated by recurring guest star Cary Elwes (Despereaux!) — also were treated to a sneak peek at the season ahead. Press PLAY on the video below to see the hijinks and hilarity that awaits when Gus, Shawn and the SBPD report once more for duty.